Ptolemy's theorem visualisation. 3D graphics.
An inequality painted on the vase body.
Still life with vases - a 3D visualisation.
How to draw arcs of huge circles - usage of the "drawing tool".
How to draw arcs of huge circles - description.
Calculation of the volume of a bottle partially filled with a fluid.
Permutation theorem and its use to proving inequalities.
The sum of the triangle sides lengths reciprocals vs a cyclic sum of a specific form.